Programming languages are merely brushes with which to paint logic. I'm going to level with you, the choice of language is a combination of luck, personality a

Programming languages are merely brushes with which to paint logic. I'm going to level with you, the choice of language is a combination of luck, personality and circumstance. Nothing else. There is no hidden knowledge, font of programming youth, etc, etc, Its like choosing a building material, when you want to make a house. Most people choose bricks. When used properly you can make many a wonderful, functional and innovative house. In short you can do all of the things you want with any Turing complete language. As for scaling, its mostly never down to the language, its almost always system design. Crucially its knowing when, where and how to store state. Does it need to be shared?, does it need to be consistent?, how can you partition? what stuff can you push out to static storage? None of those questions are answered by a language. The stated scale (10million requests in a day) is roughly 120 requests a second. Most systems _should_ be able to handle that without costing the earth hosting wise. Hell, the API I look after can do 5000 concurrent requests, ~8000 requests a seconds using about 2.5 cores. That's in python without any real optimisation. Its not because python (or my skill) is awesome, its because CPUs are really really powerful now. A skilled programmer could easily get 2-5X more performance, but it'd cost at least 5 years of hosting to get them in and optimise it. TL;DR: Its not the language, its the business plan and design that matters.